Cross roller bearing plug drawing tool

Abstract

The utility model relates to a cross roller bearing plug drawing tool, which belongs to the field of bearing tool design and comprises a bolt, a collision block sleeved in the middle of the bolt and capable of moving up and down, a connecting ring fixedly sleeved at the bottom of the bolt and a screw fixedly penetrating through the connecting ring, and the top of the screw is arranged in the connecting ring. The bottom of the screw is located on the outer side of the connecting ring and can be connected with an outer diameter plug. The drawing tool is easy to manufacture, the outer diameter plug 8 can be easily pulled out during operation, fine adjustment of the radial position of the plug can be achieved, the drawing tool is labor-saving in operation, the plug is not prone to being pulled and damaged, and meanwhile the defect that fine adjustment of the radial position cannot be achieved when a vice is pulled out is overcome.

Description

Technical Field

[0001] The utility model belongs to the field of bearing tooling design, and particularly relates to a plug pulling tool for an outer diameter blocked crossed roller bearing. Background Technique

[0002] At present, for the crossed roller bearings used in industrial robot joints, many ball loading holes are provided with cylindrical holes on the outer diameter, plugs are installed in the holes, and taper pins are installed on the end faces to position the plugs. Since the plug holes penetrate the outer diameter and the raceway, after the plugs are installed, in the ideal state, the raceway surface of the plug is flush with the raceway surface of the ring, and at this time, the rotation flexibility of the bearing is the most ideal. The radial limit of this type of plug in the ball loading hole is achieved by the taper pin. The magnitude of the tightening force applied to the end face of the taper pin when installing the taper pin will affect the radial position of the plug. At the same time, in order to ensure the rigidity of the industrial robot bearing, the bearing rings have all undergone integral heat treatment, and the taper pins and taper pin holes will inevitably be deformed, which results in a poor fit between the taper pins and the taper pin holes after heat treatment. Although the taper pins are generally replaced before the final grinding of the raceway, the deformation of the taper pin holes is difficult to repair, and the pressure applied to the large end face of the taper pin to fix the plug is also different. Once the pressure is too large, the taper pin and the hole are too tightly fitted, and the raceway surface of the plug will protrude from the raceway surface of the ring, resulting in rotational jamming and vibration. In this case, the plug needs to be slightly moved in the direction of the outer diameter, and this small movement requires the assistance of a special pulling tool. At the same time, tools are also needed when disassembling the bearing to pull out the plug.

[0003] At present, on-site assembly workers use pliers to pull the screws pre-screwed on the outer diameter plugs to pull out the plugs. The pulling force of the pliers is difficult to control, and the outer diameter of the wedge block often has scratches after being pulled out. After reinstalling the plug, the rotation flexibility of the bearing will be affected to a certain extent. In view of the current situation, a pulling tool that can achieve fine adjustment of the radial position of the plug and is easy to control the force and operate is needed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a plug pulling tool for a crossed roller bearing to solve the problems of plug pulling and fine adjustment of the radial position of the outer diameter blocked crossed roller bearing.

[0005] To achieve the above purpose, the technical solution of the utility model provides a plug pulling tool for a crossed roller bearing, including a bolt, a striker sleeved on the middle part of the bolt and movable up and down, a connecting ring fixedly sleeved on the bottom of the bolt, and a screw fixedly penetrating through the connecting ring. The top of the screw is arranged inside the connecting ring, the orientation of the screw is the same as that of the bolt, and the bottom of the screw is located outside the connecting ring and can be connected to the outer diameter plug.

[0006] Preferably, the bolt is an internal hexagonal bolt.

[0007] Preferably, a gasket and a nut are provided in the middle of the screw, and the screw is in contact with the bottom surface of the connecting ring.

[0008] Preferably, the hexagon socket head bolt is M8 or M10, and the length is greater than or equal to 70 mm.

[0009] Preferably, the hole diameter of the impact block for sleeving the bolt is 0.8 to 1.2 mm larger than the outer diameter of the bolt.

[0010] Preferably, the width of the impact block is 30 mm and the outer diameter is 45 mm.

[0011] Preferably, the hole diameter of the connecting ring for sleeving the screw is 0.2 - 0.5 mm larger than the top of the screw.

[0012] Preferably, the threaded length of the screw located outside the connecting ring is more than 5 pitches except for the widths of the gasket and the nut.

[0013] In summary, the utility model has the following beneficial technical effects:

[0014] The utility model is simple to manufacture. During operation, only by applying an impact force to the hexagon socket head bolt 1 through the impact block 2 can the outer diameter plug 8 be easily pulled out, and the fine adjustment of the radial position of the plug can be achieved by controlling the impact force. Compared with the previous method of using a vise to hard pull the plug on the screw, this pulling tool is labor-saving in operation, not easy to damage the plug, and at the same time makes up for the shortcoming that the vise cannot achieve fine adjustment of the radial position when pulling out. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a plug pulling tool for a crossed roller bearing of the utility model;

[0016] Figure 2 is a schematic diagram of the actual operation of a plug pulling tool for a crossed roller bearing of the utility model.

[0017] Reference numerals: 1, hexagon socket head bolt; 2, impact block; 3, connecting ring; 4, screw; 5, gasket; 6, nut; 7, bearing outer ring; 8, outer diameter plug; 9, taper pin; 10, bearing inner ring; 11, end face of bolt head. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] An embodiment of the utility model discloses a plug pulling tool for a crossed roller bearing. The plug pulling and radial position fine-tuning tool for the outer diameter of the bearing is composed of the following parts (see Figure 1 ):

[0020] The hexagon socket head cap screw 1 passes through the central hole of the impact block 2. The screw 4 is inserted into the smooth hole at the lower part of the connecting ring 3 from the threaded hole of the connecting ring 3, and then the hexagon socket head cap screw 1 is screwed into the threaded hole on the upper surface of the connecting ring 3 to press the head of the screw 4. A washer 5 and a nut 6 are added to the part of the screw 4 exposed from the connecting ring 3. By holding the impact block 2 and reciprocating axially along the outer diameter of the bolt to impact the end face 11 of the bolt head, the force is transmitted to the screw 4 through force transmission. The screw 4 is connected to the threaded hole on the outer diameter plug 8, so that the function of pulling out the outer diameter plug 8 can be realized. At the same time, by controlling the impact force and distance, the function of fine-tuning the radial position of the bearing plug can be realized.

[0021] Structure description: The hexagon socket head cap screw 1 generally adopts M8 or M10, and the length generally takes more than 70 mm. The diameter of the hole drilled in the center of the end face of the impact block 2 is 0.8 to 1.2 mm larger than the outer diameter of the bolt, ensuring that the contact width between the end face of the impact block 2 and the end face 11 of the bolt head is not less than 2 mm. If the contact surface is too narrow, a greater impact force needs to be applied to the contact surface of the bolt head. The width of the impact block 2 generally takes about 30 mm (ensuring the reciprocating movement stroke on the bolt), and the outer diameter is about 45 mm (ensuring the weight of the impact block 2 for easy operation). At the same time, the outer diameter is knurled, so that it is not easy to slip during operation. The center of the end face of the connecting ring 3 is drilled and tapped. The size of the threaded hole needs to match the thread of the hexagon socket head cap screw 1. A smooth hole is drilled at the bottom of the threaded hole, and the diameter of the smooth hole is 0.2 - 0.5 mm larger than the diameter of the screw 4. If the gap is too large, the screw 4 is easy to shake during the pulling operation, affecting the pulling effect, and at the same time, the screw 4 is also very easy to be damaged. In order to avoid the screw 4 shaking during pulling, a washer 5 and a nut 6 are added to the screw 4. The depth of the threaded hole and the smooth hole on the upper surface of the connecting ring 3 need to be determined according to the length of the used bolt and the screw 4, and it is necessary to ensure that the threaded length of the screw 4 coming out of the smooth hole is more than 5 thread pitches in addition to the width of the washer 5 and the nut 6.

[0022] This pulling tool is simple to manufacture. Except for the impact block 2 and the connecting ring 3 that need to be drilled and tapped, the rest of the accessories are standard parts. During operation, only by applying an impact force to the hexagon socket head cap screw 1 through the impact block 2 can the outer diameter plug 8 be easily pulled out, and the fine-tuning of the radial position of the plug can be realized by controlling the impact force. Compared with the previous method of using a vise to pull the screw on the plug hard, this pulling tool is labor-saving in operation, not easy to damage the plug, and at the same time makes up for the shortcoming that the vise cannot realize the fine-tuning of the radial position when pulling out.

[0023] The steps of pulling the plug by the utility model are as follows:

[0024] 1. Knock out the taper pin 9 on the end face of the inner ring 10 of the bearing from the small end of the taper pin hole to the large end of the taper pin hole.

[0025] 2. Screw the screw 4 at the front end of the tooling into the threaded hole of the outer diameter plug 8. The depth of the screw 4 into the plug should be no less than 5 thread pitches.

[0026] 3. Hold the outer diameter of the striker 2 on the tooling firmly by hand, and by quickly moving back and forth along the radial direction of the bearing to strike the end face of the bolt, transfer the outward pulling force to the wedge block through the screw thread connection, so as to achieve the purpose of pulling out the wedge block. The magnitude of the impact force can be adjusted according to the tightness of the wedge block.

[0027] The impact force for pulling out the wedge block through this tooling can be adjusted, and the process of applying the pulling force is relatively gentle. It is not easy to scratch the wedge block during the pulling-out process. Moreover, compared with the method of pulling out the wedge block by connecting the screw with a vise, this method of striking the end face of the bolt by the striker 2 is more labor-saving.

[0028] Situations where the plug needs fine adjustment:

[0029] 1. Since the operators are different during the installation of the taper pin 9 between processes and during assembly, if the assembly worker strikes the taper pin 9 with a greater force during assembly than during the installation between processes, the raceway surface of the taper pin 9 may protrude from the raceway surface of the ring, which may cause the roller to get stuck and vibrate when rotating to this position. In this case, it is necessary to finely adjust the radial position of the wedge block outward.

[0030] 2. Since the outer ring is quenched as a whole, the taper pin hole and the taper pin 9 will have slight deformation. Before assembly, a new unquenched taper pin 9 will be replaced. In this way, there may be a small deviation in the fit between the new taper pin 9 and the original taper pin hole, which may cause the raceway surface of the wedge block to slightly protrude from the raceway surface after the taper pin 9 is knocked into the taper pin hole, resulting in jamming and vibration. To correct this situation, it is necessary to finely adjust the position of the wedge block outward.

[0031] The method for finely adjusting the plug of the present utility model is as follows:

[0032] a. Screw the screw at the front end of the tooling onto the outer diameter plug 8;

[0033] b. Hold the striker 2 on the tooling by hand, and by quickly moving back and forth along the radial direction of the bearing to strike the end face of the bolt, transfer the outward pulling force to the wedge block through the screw thread connection. Since the taper pin 9 has been installed on the end face of the bearing, the outward pulling can only cause a very small displacement of the plug radially. After the striker 2 strikes several times, rotate the inner ring. If there is no obvious vibration and jamming at the plug, the fine adjustment process ends. If there is still vibration and jamming, repeat the previous steps until there is no obvious vibration and jamming and then stop.

[0034] This fine adjustment method is simple to operate, and there is no need to repeatedly disassemble the wedge block to replace the taper pin 9, which improves the assembly efficiency.

[0035] This drawing and fine-tuning radial position tooling is easy to operate. The standard screw 4 used for the front-end screw has a very low replacement cost, and is very convenient for disassembly and assembly, and is easy to promote in enterprises.

[0036] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A plugging and pulling tooling for a crossed roller bearing, characterized in that It includes a bolt, a striker (2) sleeved on the middle part of the bolt and capable of moving up and down, a connecting ring (3) fixedly sleeved on the bottom of the bolt, and a screw (4) fixedly penetrating through the connecting ring (3). The top of the screw (4) is arranged inside the connecting ring (3), the orientation of the screw (4) is the same as that of the bolt, and the bottom of the screw (4) is located outside the connecting ring (3) and can be connected to an outer diameter plug (8).

2. The plug pulling tool for a cross roller bearing according to claim 1, wherein, The bolt is an internal hexagon bolt (1).

3. The plug-pulling tooling for a crossed roller bearing according to claim 2, characterized in that, A gasket (5) and a nut (6) are arranged in the middle of the screw (4), and it contacts the bottom surface of the connecting ring (3).

4. A plugging and pulling tool for a crossed roller bearing according to claim 3, characterized in that, The internal hexagon bolt (1) is M8 or M10, and its length is greater than or equal to 70 mm.

5. A plug-pulling tooling for a crossed roller bearing according to claim 4, characterized in that, The hole diameter of the striker (2) for sleeving the bolt is 0.8 to 1.2 mm larger than the outer diameter of the bolt.

6. The plug-pulling tooling for a crossed roller bearing according to claim 5, wherein The width of the striker (2) is 30 mm, and the outer diameter is 45 mm.

7. A plug pulling tool for a crossed roller bearing according to claim 6, characterized in that The hole diameter of the connecting ring (3) for sleeving the screw (4) is 0.2 - 0.5 mm larger than the top of the screw (4).

8. A plugging and pulling tooling for a crossed roller bearing according to claim 7, characterized in that, The thread length of the screw (4) located outside the connecting ring (3) is more than 5 pitches except for the widths of the gasket (5) and the nut (6).

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